2, 1, 1/2, 1/4, . . . . . . What number should come next?

1/3

2/8

1/8

1/16

2/5

This is a simple division series; each number is one-half of the previous number.

In other terms to say, the number is divided by 2 successively to get the next result.

4/2 = 2

2/2 = 1

1/2 = 1/2

1/2/2 = 1/4

1/4/2 = 1/8 and so on.